Elevating-truck.



W l. ADAM.

ELEVATING TRUCK.

APPLICATION FILED nJv.2s,1913.

Patented Dec. 26, 1916.

2 SHEETS SHEET 1- w. J. ADAM. ELEVATING TRUCK.

Ai" CATION HLED NOV, 28, I913 Patented Dec. 26, 1916.

2 SHEETS-SHEET 2.

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WILLIAM J. ,enhiu, or'honwoon, MASSACHUSETTS, nssroivolt "r0 summon sense, or. NOBWOOID, messeouusnrrs, A conrons'rzon or MASSACHUSETTS.

ELEVATING-TRUEK.

Specification p t-Letters Pa tent.

Patented'bee. 26, 1916.

Application iiledilovember 28', 1913'. semi No. 603,613.

skilled in the 'ert to which it'upperteins tomelre end use the some.

The inventmn relates to that class of trucks in wh1ch the load is supported on u vertically movable table which may be raised I to transfer the load to thetruck or may be lowered to transfer the load from the truck to another support. p

The object of the invention is to provide novel and improved mechanism for raising and lowering the table of this type of truck which will enable the load to be readily end convenientlyhandled with comparatively littleex'ertion on the part of the operator.

A further. object of the invention is to provide novel and improved means for connecting the table raising and lowering mechanism with itsopereting lever, so that the lever me. be readily connected with or disconnects; from the raising and lowering mechanism This means is preferably so constructed and operated that the lever is not operative, to effect the lowering of the table untillfthe connecting. ineans is set by the operator, thus avoiding any accidental or remeture lowering of the table by manipuution of'the operating lever.

To these ends the invention consists in the features of construction and combinations of parts hereinafter described and referred to in the chums.

The various features of the invention will i be readily understood from on ins pection of the accompanying drawings and the follow.

ing deteiled-descrh tion of the truck illustrated therein. r

In the drawings, Figure 1 is u plen view of a truck embodying the invention in its preferred form; Fig. 2 is a verticul sectional view on line 22, Fig. 1; Fi 3 is is vertical sectional view on line 33, ig. 1; Fig. 4: is a. view similar-to Fig. .3, showing the table in its raised position; Fi 5 is a detail sectional elevutionshowingt e means for 0 werating the raising and lowerin r wedges; ig. 6 is a similar viewshowing t e parts in an- .supporting Wheels.

ments' controlled.

other position; Fig. 7 is a plan view of the ports shown in Fig. 5; the table bein removed; Fig.- 8 is e- 'front elevetion'o one side ofthe truck; and Fig. 9 is a sectional rear elevation showing one of'the rear raising and lowering wedges and one of-the rear As shown in the drawin s; the truck car riage comprises. the body. rame 1 to which the rear exleil 1d front c3116 3 are secured.

' The, carriage is supported upon, four wheels .4, the two rear wheels being mounted upon trunnions formed at theend. of the rear axle 2 and the two forward wheels being mounted upon trunnions formed on steering knuckles 5 which are pivoted in the ends of the front axle. The steering knuckles are provided with arms 6 connected by a link 7. The link 7 is connected by a pin and slot connection 8 ivith a. steering lever 95 the rear end of which 18 pivoted on the front axle? 'end'the front end ofwhich le -connected to w tongue 10 by which. the truckis propelled and its move- The vertically movable table of the truck comprises the side bars.11 which are connected by the front and-gear cross bars 12 and 1.3. The table is guided so that it will move vertically .bya vertical guide pin 14 secured 'in a boss formed at the center of the rear uxleund fitting Withina hole formed in :1 guide plate 15 secured to the under side 01" the cross bar 13 -(Figs. 1'

andP); a

The mechanism for raising and lowering the tuble comprises four wedges provided with inclined upper and lower edges and adapted to be moved longitudinally between rolls mounted upon the carriage. and table respectively The two front wedges 16 are formed on a wedge plate 17 end are orranged-to move between rolls 18 mounted on the front end of the frame 1 und rolls 19 mounted upon the brackets 20 which are secured tothe cross-bar 12 of the table. The brackets are provided with upwardly rojectingposts 20 adapted to engage the oad when the truck is run under it to properly osition the truck with reference to the load. he rolls 18 and 19 engage the lower and upper inclined edges of the wedges 16, and are )rovided with flanges which form lateral gui es to embruce the wedges and hold them against transverse movement, and also prevent transverse movement of the table. The front wedge plate 17 is connectedby rods l with the rear wedges 22. and the rear wedges are held in fixed relation transversely by a erossa-od 23. The wedges and the connecting rods thus form a rigid frame which may be moved longitudinally in raising and lowering the table, and which itself moves vertically during its longitudinal movenu-nt. The rear wedges 22 are engaged by lower rolls 2-! and upper rolls 25' mounted upon the rear end of the frame 1 and upon the under side of the crossbar 13 respectively, the rolls being provided with flanges which form lateral guides to embrace the wedges and retain the wedge frame and table in proper relation to the carriage. and to each other. The wedges are provided at their. smaller ends with curved surfaces 96 forming stops for engaging the rolls and limiting the movement ofthe \\'edge frame in lowering the table. The front wedges 16 are also provided with recesses 27 at their larger ends which receive the rolls 1S and 19 when the table is raised arid-retain the wedge frame in the position Into which it has been moved in raisin the table The retaining recesses may be farmed in the rear wedges instead of in the front wedges, or both sets may be provided with these recesses.

The means for operating the wedge frame to raise or lower the table. comprises a lever 28 ivotcd to the front end of the frame 1 and provided with a socket for receiving the operating handle 29. The rear end of the lever extends laterally in both directions, and carries two rolls 30 arranged to engage the rear sides of two lugs or arms M which project inwardly from the wedges 16. hen the lever 28 is swung from the position indicated in Fig. 2 to the position indicated in Fig. 4. the rolls 30 acting against the lugs 31 move the wedge frame toward the left, 'thus forcing the wedges between the rolls on the carriage and table, and lifting the table into the elevated position indicated in Fig. 4. \Vhen the wedge frame and table reach this position the rolls 1S and 19 enter the recesses 27 in the wedges l6 and lock the wedge frame and table in position. The lever 28 may now be swung up into the position indicated in Fig. 2, or otherwise manipulated without affecting the wedge frame and without disturbing the table.

The meanstor connecting the o crating lever 28 to the wedge frame to c lowm'ing of the table comprises a latch in the form of a bail 32 pivoted to the lugs 31 of the wedges 16 and arranged to move down back of the rear arm of the lever 28 when the lever is in the position indicated in Fig. 5. When the latch is raised the handle 29 may be moved up into vertical position without-operating the wedge frame to lower the table, initwbeu the latch is lowered it conncrts the rear arm of the lever 28 to the wedge frame so thatthe frame will be operact the atcd to lowcrthe table when the handle 29 is raised. In the construction shown the connccling latch 32 is held normally in inactive position above the path of the levcr 25 by a weight '33 pivoted to oneof the lugs 31 and connected with the latch by a chain IM- or other connection. The weight is supported in normal position upon a sto When the operator desires to lower tie table he swings the lever 29 down into theposition indicated in Figs. 5 and (i. and then throws the weight 33 forward into the position indicated in Fig. 6. This allows the latch 32 to drop down into active position. Now when the. lever '29 is moved upward toward the position indicated in Fig. 2, the lever 28 will act upon the latch 32 and move the wedge frame toward the right'until the rolls 18 and 19 are disengagcd from the recesses 27. The weight of the table will then cause the wedge frame to move into its retracted position. As the wedge frame moves toward the right, the weight 33 will strike one of the roll'earrying brackets on the cross bar 12, and will be swung back into the position indicated in Fig. thus raising the latch 3250 that the lever 28 is automatically rendered inactive to lower the table. With this mechanism, the devices for raising and lowering the table are inactive to lower the table until set by the operator, and after having been set, are again rendered inactive by the lowering of the table. The retention of the table in its raised position until the load is to'be transferred, or until the operator intentionally lowers the table, is insured.

llaving explained the nature and object of the invention. and specifically described one form of mechanism in which it may be embodied. what is claimed is:'

I. An elevating trucle'having, in combination. a carriage. a vertically movable table, a front wedge plate provided with two \vcdgcs having upper and lower inclined edges. two rcar wedges having 'npper and lower inclined edges. rods connecting the rear wedges to the wedge plate.- across rod connecting the rear wedges. rolls on the carriag'o provided with flanges embracing the lower edges of the wedges. rollson the table pvovidcd with flanges cmla'acing the upper edges ol the wedges. guiding devices for preventing longitiulinal movement of the able, and means for moving the wedge frame longitndimilly.

:2. .\n elevating truck. having, in combination. a carriage, .1 vertically movable table. a vcrtirall movable wedge frame providcd with two rear and two front wedges having upper and lower inclined edges. rolls on the carriage engaging the under edges of the wedges and provided with flanges for preventing transverse movement of the frame, rolls on the table engaging the upper edges of the wedges and provided with flanges for preventing transverse movement of the table, and means formovingthe wedge frame longitudinally. i

3. An elevating truck, having, in combination, a carriage, a vertically movable table, a vertically movable wedge frame rovided with two rear and two front we gcs having upper and lower inclined edges, one set of wedges being provided with looking recesses at their large ends, rolls on the carriage engaging the under edges of the wedges and provided with flanges for preventing transverse movement of the frame, rolls on the table engagin the u per edges of the wedges and .provi ed wit 1 flanges for preventlng transverse movement of the. table, and means for, moving the wedge frame longitudinally.

4. An elevating truck, having, in combination, a carriage, a vertically movable table, a vertically movable wedge frame provided with wedges having upperand lower inclined edges, rolls on the carriage and table respectively between which the Wedges play, an operating lever normally connected to move the wedge frame in a direction to raise the table, and means under the control of the operator for connecting the lever to move the frame in the opposite direction.

5. An elevating truck, having, in combination, a carriage, a vertical y movable table, mechanism for raising and lowering the table including a wedge frame provided with a, projection, an operating lever provided with an arm engaging the projection to move the frame in a direction to raise the table, and normally inactive means adapted to be set by the operator for connecting the wedge frame with the lever to move the frame in the opposite direction.

6. An elevating truck, having, in combination, a carriage, a table, mechanism for raising and lowering the table, including a reciprocating frame, an operating lever, devices normally connectmg the operating lever and said frame whenever the table is in lowered position, and devices which are normally inactive and are adapted to be set by the operator for connecting said operating level-with said frame when the table is in I raised position.

An elevating truck, having, in combination, a carriage, a table,jmechanism;for raising and lowering the table, operating means for actuating said mechanism to raise the table, a device adapted to be set by the operator for connecting said means with said mechanism to lower the table, and means for automatically rendering the connecting device inoperative by the move- I ment of the parts in lowering the table.

8. An elevating truck, having, in combina- 'tion, a carriage, a tablehmechanism for raising and lowering the ta is including a 'reciprocating frame, a projection on the frame, an operating lever having an arm en aging the projection to move the frame in a irection to raise the table, and a latch adapted to be set by the operator for connecting the lever to move the frame in the other direction.

9. An elevating truck, having, in combination, a carriage, raising and lowering the table including a reciprocating frame, a projection on the frame, an operatin lever having an arm engaging the projection to move the frame in a direction to raise the table, to be set by the operator for connectin lever to move the frame in the other tion, and means for rendering the latch operative inlowering the table.

10. An elevating truck, having, in combination, a carria e, a verticall movable table, mechanism or raising and lowering the table including an operating lever having an arm, a reciprocating frame having a shoulder arranged to be engaged by the arm on theoperating lever, and a. latch on the frame movable into and out of position back of the arm of the operating lever.

the

rec-

iii-

11. An elevating truck, having, in com- .wedges, guiding devices for preventing of the table, and

longitudinal movement wedge frame longimeans for moving the tudinally.

12. An elevating truck, having, in combination, a carriage, a vertically movable table, a vertically movable wedge frame between the carriage and table provided with two rear and: two front wedges having upper and lowerinclined ed es, rolls on the carriage engaging the un er edges of the wedges, rolls on the table engaging the upper edges of the "wedges, lateral guides at the sides of the rolls embracing the wedges to maintain the wed e frame, table and carrings in proper re WILLIAM J. ADAM. Witnesses N. D. MGPHAIL, G20. E. Srnnsms.

a latch adapted a table, mechanism. for

at ion, and means for l moving the wedge frame longitudinally. 

